It's time to meet 2014 MU69.
MU69 is far from your run-of-the-mill solar system object.
Here are some highlights from its journey
From the Popular Science archives.
Is there a planet—or even planets—waiting to be discovered out there?
Another day, another hypothetical object on the outskirts of the solar system.
A gallery of photos, visualizations, and other pictures of outer space.
More exciting news about cold, dead rocks
This summer, the mission may get funding to travel to a mysterious rock at the edge of the solar system
How skeptical should we be, and how will we find out if this mystery planet is really out there?
Scientists are hot on the trail of our solar system's 9th planet
How much are we really paying to explore the universe?
The ocean-filled moon might hold the life we've long searched for in space. And scientists have one shot to reach it.
A total eclipse of the heart
They're teasing us with this awesome false-color picture
It just keeps getting better
The latest and greatest images from the New Horizons mission
Can you feel the love?
NASA releases a breathtaking close-up right before New Horizons flyby
Popular Science goes way back
Witness history in the making
New Horizons scientist Leslie Young discusses what to expect from the flyby on Tuesday, and the 28-year wait leading up to it
And he thinks the upcoming flyby will prove it
This year's missions to the outer solar system are set to shake up the planetary family tree